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A few more things
Chris Waldrup
Hi Guys,
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I am working on getting this little receiver up and running but noticed a few things I wanted to ask of those more experienced. I connected my generator and set it to 7.040 Mhz at -60 dBm then went to the General tab and clicked on Calibration. I set the frequency in the field to the generator frequency and clicked on start and it gave me a Frequency Calibration Complete message. I did the same thing for amplitude, so now the peak on the spectrum display is at -60 dBm. However the displayed reading for the RX meter at the top right says -83.2 dBm. As I tune around and the peak disappears the reading changes. What causes the discrepancy between the signal meter reading and the spectrum peak's value- is the reading an average between the signal and the noise floor? The clicking was stopped by selecting MME under the Primary Sound Card setup details field under Audio. Thanks Bruce for this help. I was worried that I had to get a new soundcard for the computer (which is new, so I hate to replace something that isn't broken). I worked more with the Image Reject feature under DSP and I can only null it by about 10 dB. It is sitting at about -65 dBm right now. The best null comes with the Phase all the way to 400 at far right and the Gain all the way to -500 at far left. The controls are at the end of their setting so I need more range and I don't get the twitchy response that Bill mentioned. I went back to the General tab and clicked on calibrate Image Null (above values) and got an message that says "Error calculating image null. Please try again." Does this mean that the receiver is bad or is there something in the software I need to change? Thanks again for a great little receiver and especially for this forum that we can get almost real time help from the designers and more experienced users. It helps tremendously! Chris KD4PBJ ----- Original Message -----
From: "Chris Waldrup" <kd4pbj@...> To: <softrock40@...> Sent: Thursday, October 06, 2005 6:56 PM Subject: Re: [softrock40] Re: Softrock up and running but need a little guidance Hi Bruce,RAM so this should be fast enough.guidance Hi, Chris. |
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